you need to connect to bsc test network shown here 
[https://dapp-world.com/blogs/01/how-to-connect-metamask-to-binance-smart-chainbsc--1618137142422][1]

Then from remix's deploy section 
choose Web3 Provider and then deploy 

Hope it works 


  [1]: http://%20https://dapp-world.com/blogs/01/how-to-connect-metamask-to-binance-smart-chainbsc--1618137142422